CAJ | 학술논문

基于模块化多电平换流器(modular multilevel converter，MMC)的统一潮流控制器(unified power flow controller，UPFC)有谐波特性好、易于模块化设计、体积紧凑和不需要器件直接串联等优点，适用于高压大容量的输电领域，可提高线路输电容量，改善系统暂态稳定，优化潮流，降低网络损耗，受到了广泛重视。基于MMC的UPFC的动态模型是理解其工作原理和设计控制器的基础，分层次地逐步建立MMC型的UPFC开关周期平均模型和简化开关周期平均模型，并通过仿真验证模型的合理性；最后在RTDS上对MMC型UPFC进行内部动态特性仿真，对仿真结果进行详细分析，仿真和分析结果表明基于MMC的UPFC的串联侧和并联侧内部动态有很大的差异，该结论和所建立的动态模型得到相互印证。
기우모괴화다전평환류기(modular multilevel converter，MMC)적통일조류공제기(unified power flow controller，UPFC)유해파특성호、역우모괴화설계、체적긴주화불수요기건직접천련등우점，괄용우고압대용량적수전영역，가제고선로수전용량，개선계통잠태은정，우화조류，강저망락손모，수도료엄범중시。기우MMC적UPFC적동태모형시리해기공작원리화설계공제기적기출，분층차지축보건립MMC형적UPFC개관주기평균모형화간화개관주기평균모형，병통과방진험증모형적합이성；최후재RTDS상대MMC형UPFC진행내부동태특성방진，대방진결과진행상세분석，방진화분석결과표명기우MMC적UPFC적천련측화병련측내부동태유흔대적차이，해결론화소건립적동태모형득도상호인증。
The unified power flow controller (UPFC) based on modular multilevel converter (MMC) has good harmonic characteristics, on which it is simple to implement modular design. It also has the advantages of compact volume and no need to connect power semiconductor devices in series. It is applied to the field of high-voltage large-capacity power transmission. And it can improve transmission capacity of lines and system transient stability; optimize power flow to reduce network losses. Thus it receives much attention. The dynamic modeling of UPFC based on MMC is the key to revealing its working principle and designing the controller. Cycle by cycle switch average model and simplified cycle by cycle switch average model of UPFC based on MMC are gradually established and verified by simulation. Finally the simulation by RTDS about internal characteristic of UPFC based on MMC is conducted, and the simulation results are analyzed in detail. Simulation and analysis results show that the internal characteristics of the parallel and series parts of the UPFC based on MMC are quite different, and this conclusion and the dynamic modeling mutually verify each other.